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  <title>OpenSLP Programmers Guide - SLPFindSrvs()</title>
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<h2>SLPFindSrvs<br />
<span id="breadcrumbs"><a href="index.html">OpenSLP Programmer's Guide</a> &raquo; Service Location Functions &raquo; <a href="SLPFindSrvs.html">SLPFindSrvs</a></span></h2>

<h3>Declaration</h3>

<pre>#include &lt;slp.h&gt;

<a href="SLPTypes.html#SLPEXP">SLPEXP</a> <a href="SLPError.html">SLPError</a> <a href="SLPTypes.html#SLPAPI">SLPAPI</a> SLPFindSrvs(
    <a href="SLPTypes.html#SLPHandle">SLPHandle</a>         <a href="#hslp">hslp</a>,
    const char *      <a href="#srvtype">srvtype</a>,
    const char *      <a href="#scopelist">scopelist</a>,
    const char *      <a href="#filter">filter</a>,
    <a href="SLPSrvURLCallback.html">SLPSrvURLCallback</a> callback,
    void *            <a href="#cookie">cookie</a>);
</pre>

<h3>Description</h3>

<p>Issue a query for services.</p>

<h3>Parameters</h3>

<table nosave="" border="1" cellpadding="5">
  <tbody>
    <tr nosave="" valign="top">
      <td nosave=""><a name="hslp"></a><tt>hslp</tt></td>
      <td nosave="">The language specific <tt>SLPHandle</tt> on which to 
	  register the service.</td>
    </tr>
    <tr nosave="" valign="top">
      <td><a name="srvtype"></a><tt>srvtype</tt></td>
      <td nosave="">The service type string, including the authority string (if 
	  any) for the request.&nbsp; May not be the empty string, &quot;&quot;. May not be NULL.&nbsp; 
	  See <a href="Syntax.html">Syntax</a> more information on Service Type 
	  syntax.&nbsp;</td>
    </tr>
    <tr nosave="" valign="top">
      <td><a name="scopelist"></a><tt>scopelist</tt></td>
      <td nosave="">A pointer to a comma separated list of scope names.&nbsp; <i>May 
	  be the empty string </i>if you wish to use scopes this machine is 
	  configured for..&nbsp;</td>
    </tr>
    <tr nosave="" valign="top">
      <td nosave=""><a name="filter"></a><tt>filter</tt></td>
      <td>A query formulated of attribute pattern matching expressions in the 
	  form of an LDAPv3 search filter.&nbsp; Pass in&nbsp; the empty string, &quot;&quot; for all 
	  services of the requested type.&nbsp; See <a
 href="Syntax.html">Syntax</a>
	  for more information on LDAP3 search filter syntax.</td>
    </tr>
    <tr nosave="" valign="top">
      <td><a name="callback"></a><tt>callback</tt></td>
      <td nosave="">The address of an <a href="SLPSrvURLCallback.html">
	  SLPSrvURLCallback</a>
	  function that will be called to report the results of the query.&nbsp; May not 
	  be NULL. See <a href="Callbacks.html">Callbacks</a> for more information 
	  on how callbacks are used by the SLPAPI.</td>
    </tr>
    <tr nosave="" valign="top">
      <td nosave=""><a name="cookie"></a><tt>cookie</tt></td>
      <td nosave="">Pointer to memory that gets passed to the callback code.&nbsp; 
	  May be NULL.</td>
    </tr>
  </tbody>
</table>
<h3>
Returns</h3>
<table nosave="" border="1">
  <tbody>
    <tr nosave="">
      <td nosave="">SLP_OK</td>
      <td>Indicates that the no error occurred during the operation.</td>
    </tr>
    <tr>
      <td>SLP_PARSE_ERROR</td>
      <td>The SLP message was rejected by a remote SLP agent. The API returns 
	  this error only when no information was retrieved, and at least one SA or 
	  DA indicated a protocol error. The data supplied through the API may be 
	  malformed or a may have been damaged in transit.</td>
    </tr>
    <tr>
      <td>SLP_AUTHENTICATION_ABSENT</td>
      <td>If the SLP framework supports authentication, this error arises when 
	  the UA or SA failed to send an authenticator for requests or 
	  registrations.</td>
    </tr>
    <tr>
      <td>SLP_AUTHENTICATION_FAILED</td>
      <td>If the SLP framework supports authentication, this error arises when a 
	  authentication on an SLP message failed.</td>
    </tr>
    <tr>
      <td>SLP_NETWORK_TIMED_OUT</td>
      <td>When no reply can be obtained in the time specified by the configured 
	  timeout interval for a unicast request, this error is returned.&nbsp; In other 
	  words, slpd is running, but something is wrong with it</td>
    </tr>
    <tr>
      <td>SLP_NETWORK_INIT_FAILED</td>
      <td>If the network cannot initialize properly, this error is returned. 
	  Will also be returned if an SA or DA agent (slpd) can not be contacted.&nbsp; 
	  slpd must be running in order to call SLPReg() or SLPDereg().</td>
    </tr>
    <tr>
      <td>SLP_MEMORY_ALLOC_FAILED&nbsp;</td>
      <td>Out of memory error</td>
    </tr>
    <tr>
      <td>SLP_PARAMETER_BAD</td>
      <td>If a parameter passed into a function is bad, this error is returned.</td>
    </tr>
    <tr>
      <td>SLP_NETWORK_ERROR</td>
      <td>The failure of networking during normal operations causes this error 
	  to be returned.&nbsp; In OpenSLP, this is the error you'll get if an underlying 
	  socket() call failed.</td>
    </tr>
    <tr>
      <td>SLP_INTERNAL_SYSTEM_ERROR</td>
      <td>A basic failure of the API causes this error to be returned. This 
	  occurs when a system call or library fails. The operation could not 
	  recover.</td>
    </tr>
    <tr>
      <td>SLP_HANDLE_IN_USE</td>
      <td>Callback functions are not permitted to recursively call into the API 
	  on the same SLPHandle, either directly or indirectly. If an attempt is 
	  made to do so, this error is returned from the called API function.</td>
    </tr>
  </tbody>
</table>
<p>If no services can be found, no error is returned.&nbsp; However, no calls 
(other than the SLP_LAST_CALL) will be made to the SLPSrvURLCallback.&nbsp; Be 
aware, especially if the call is async, of error codes that may be passed to the <tt>
SLPSrvURLCallback</tt> callback function.
</p>

<h3>Status</h3>

<table nosave="" cellpadding="5">
  <tbody>
    <tr nosave="" valign="top">
      <td nosave="">OpenSLP 0.9.1</td>
      <td nosave="">Implemented as specified by RFC 2614.</td>
    </tr>
  </tbody>
</table>

<h3>See Also</h3>

<p><a href="Syntax.html">Syntax</a>, <a href="Callbacks.html">Callbacks</a></p>

<h3>Example Code</h3>

<pre>  #include &lt;slp.h&gt;

  SLPBoolean MySLPSrvURLCallback(
      SLPHandle hslp,
      const char* srvurl,
      unsigned short lifetime,
      SLPError errcode,
      void* cookie )
  {
      if(errcode == SLP_OK || errcode == SLP_LAST_CALL)
      {
          printf(&quot;Service URL     = %s\n&quot;,srvurl);
          printf(&quot;Service Timeout = %i\n&quot;,lifetime);
          *(SLPError*)cookie = SLP_OK;
      }
      else
      {
          *(SLPError*)cookie = errcode;
      }
      
      /* return SLP_TRUE because we want to be called again */
      /* if more services were found                        */
      
      return SLP_TRUE;
  }
  
  int main( int argc, char* argv[])
  {
      SLPError err;
      SLPError callbackerr;
      SLPHandle hslp;
      
      err = SLPOpen(&quot;en&quot;,SLP_FALSE,&amp;hslp);
 
      if(err != SLP_OK)
      {
          printf(&quot;Error opening slp handle %i\n&quot;,err);
          return err;
      }
      
      err =
          SLPFindSrvs( hslp,
              &quot;myservice.myorg&quot;,
              0,  /* use configured scopes */
              0,   /* no attr filter        */
              MySLPSrvURLCallback,                         
              &amp;callbackerr );
              
      /* err may contain an error code that occurred as the slp library    */
      /* _prepared_ to make the call.                                      */
      
      if((err != SLP_OK) || (callbackerr != SLP_OK))
      {
          printf(&quot;Error registering service with slp %i\n&quot;,err);
          return err;
      }
      
      /* callbackerr may contain an error code (that was assigned through  */
      /* the callback cookie) that occurred as slp packets were sent on    */
      /* the wire */
      
      if( callbackerr != SLP_OK)
      {
          printf(&quot;Error registering service with slp %i\n&quot;,callbackerr);
          return callbackerr;
      }
      
      /* Now that we're done using slp, close the slp handle */
      SLPClose(hslp);

      /* rest of program */
  }
</pre>

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